IBook thinks it has two displays

Hi all. My first post to these forums. I've never had a problem serious enough to post here before....
Purchased a used iBook Dual USB 12" 800MHz to replace one with a logic board failure. I need to run OS9 (in Japanese) for reasons that are a bit complex to go into; not using Classic in OSX but OS9 startup. This worked just fine with the original (now dead) iBook.
So, I insert an OS9.2 istall CD into this newly obtained iBook. The display switches to 640x480 in the middle of the LCD. If I go ahead and install, the installed system folder has the same behavior. Same if I copy over the system folder from the dead machine. Same with English and Japanese versions of OS9.2.
When I open the monitors control panel, two panes open up as if there are two monitors attached. Each has only one resolution option; one of is the 640x480 resolution and the other the full 1024x768.
I'm told by the previous owner that this iBook had a new logic board under the Apple replacement program. Does anyone know if there's something about the replacement logic boards that would cause this behavior? Is there anything I can do about it? I bought this iBook used specifically for this purpose, so it's a bit disappointing to find it won't work!
Thanks,
Steve
iBook Mac OS 9.2.x

Got it! Boece put me on the right track. I'm not sure how much of the following was necessary to solve the problem, but here's what I did.
I booted up in OSX. Plugged in the monitor adaptor. Downloaded the Screen Spanning Doctor hack from www.macparts.de and ran the uninstall. Restarted and nothing had changed. Ran the install. Rebooted into OS9 and magically one of the Monitor control panel panes now had the Arrangement tab (hmmm... Japanese version of OS9; I think it said Arrangement). I dragged the two monitor icons on top of each other and the screen expanded out to fill the 12" screen. Problem solved.
The previous owner said she was a designer. And she supplied the external monitor adapter. Quite likely she had run some kind of spanning hack.
I can say I've learnt something today. And wasted best part of a day trying to get my partner's computer up and running for her. But at the end of the day, it looks like we can probably screen span if we want to
Thanks. One happier used Mac buyer!
Steve

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